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% Rastrigin.m % Rastrigin function % % used to test optimization/global minimization problems % % f(x) = sum([x.^2-10*cos(2*pi*x) + 10], 2); % % x = N element row vector containing [x0, x1, ..., xN] % each row is processed independently, % you can feed in matrices of timeXN no prob % % example: cost = Rastrigin([1,2;5,6;0,-50]) % note: known minimum =0 @ all x = 0 % Brian Birge % Rev 1.0 % 9/12/04 function [out]=Rastrigin(in) cos_in = cos(2*pi*in); out = sum((in.^2-10*cos_in + 10), 2);